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Spirals Everywhere

This week's Hurricane Sandy got us thinking about spirals. Most of us have seen images of hurricanes from above – either photos from airplanes or radar taken with satellites.

There are many spiral shapes throughout nature (see the recent Here, There & Everywhere blog post at http://hte.si.edu/blog/?p=87). The most common spiral shape that Chandra or any other telescope looks at is the spiral galaxy. These galaxies – that consist of a flat, rotating disk of stars, gas, and dust in a spiral pattern – are the most common type in the Universe. Thanks to studies of how spiral galaxies behaved, astronomers decades ago found evidence for the existence of dark matter: http://chandra.harvard.edu/xray_astro/dark_matter/index2.html

Perhaps one of the most compelling reasons to study these galaxies is that our very own galaxy, the Milky Way, is a spiral. We cannot get a very good look at our galactic home as a whole because we are embedded within it. Therefore, examining similar other spirals gives us important information.

From hurricanes to galaxies, spiral structures are certainly important. While we normally focus on news of spirals of the galactic kind, our thoughts are with everyone who was affected by this week's terrestrial version.

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